Dishwashing machine



April 13, 1943.

1'.l E. D. BILDE .DISH'WASHING MACHINE meant.' s. 193s 75rd' E. a; f/de,

' Abg/s;

Patented Apr. 13, 1943 DIsHWAsmNG MACHINE Tord Erik Daniel Bilde, Ulvsunda, Sweden, assignor to Bolinders Fabriks Aktiebolag, Stockholm, Sweden, a corporation of Sweden Application october 9, 1939, serial No. 298,681 In Germany September 26, 1938 3 Claims.

Dish washing machines of the type in which the dishes are cleansed by being exposed to the action of a water jet or jets are previously known in various designs. From various points of view those machines of said type are preferred which are provided with spray pipes directing strong water jets against the dishes.

It is generally desirable to provide spray pipes below the dishes to be cleansed, for instance below a basket supporting the dishes. Thus, the articles are sprayed from below ensuring a good cleansing action also of deep articles such as glasses and cups which are placed above said spray pipes with their opening directed downwardly.

In dish washing machines and particularly in relatively small machines for domestic purposes in which due to utilization of space spray pipes for the washing operation are disposed exclusively below the dishes it may easily happen that light articles such as thin glassesare lifted and overthrown by the water jets with the risk of such articles being damaged. In order to eliminate this risk it is, of course, possible to reduce the pressure prevailing in the spray pipe, e. g. by throttling a valve or by reducing the speed of a pump forwarding the washing water. However, such a control is unsuitable in practice, it being preferred, on the contrary, in washing such light and frangible articles to operate at the same water pressure as for other articles, that is by water jets of a strength sufiicient to exert a real striking action.

It is also possible to provide the basket intended for glasses and similar articles with-a bottom of network of suiiiciently fine meshes to cause such an eective sub-division of the lwater jets as to reduce the striking action thereof, thereby eliminating the risk of the'dishes being damaged. f It is true that in such manner an effective and reliable cleansing will be attained, but thereby another dif'liculty arises. The dish washing machines not only operate with strong water jets for the washing operation but are, as a rule, also provided with separate spray nozzles for rinsing the dishes vby pure water. These rinsing nozzles are often so designed as to cause a-very farreaching sub-division of the water in order to form a close fog in the spray space wholly lling up said space in contact with all articles therein.

This finely divided water cannot, however, pene-4 trate the fine network of the bottom of such a basket to a degree suilicient to ensure an effective rinsing action.

quantity are maintained the same for both kindsv of articles.

A still further object of the invention is to provide in a dish washing machine means to reto be introduced thereinto at will.

duce the striking `action of washing water jets when relatively light and frangible dishes are to be cleansed. These means may comprise resistance members or screens capable in different positions of exerting varying resistance for the washingwater jets, said screens being built-in within the spray space of the machine or being adapted Preferably, however, the screens are mounted on the dish supporting basket proper and adapted to be brought into their position of greatest resistance by the action of the water jet or jets.

The invention will be more fully described with reference to an embodiment of same shown by way of example in the accompanying drawing.

In the drawing:

Fig. l is a somewhat diagrammatic view, partly in section, of the lower part of a dish washing machine having means for changing the striking action of the washing water according to the invention.

Figure 2 is 'a lateral view on an enlarged scale of the basket which appears in Figure 1, the front wall of the basket being omitted for the sake of clearness, and

Figure 3 is a perspective view of the basket of the preceding iigures.

In Fig. 1 reference numeral I0 designates a` said pumps being by means of a suction pipe The principal object of the present invention 55 connected with a Valve-controlled opening at the bottom of the respective tank. In Fig. 1 only the washing pump I5, its suction pipe I6 and valve l I1 are shown. Iipes i8 neet each pump with 4the position Il above the spray pipes 20, 23 support a basket 26 cleansed are placed. y y The basket 26 rests on feet 40 and its bottom comprises rods 4| extending transversely of the basket and supporting resistance members in the form of perforated screens 42 loosely hinged on said rods. Under the action of the iets ot washing water the screens 42 are swung upwardly into shown in dotted lines in Fig. 2. In

in which the dishes to be or rest position, when subjected to the action thereof.

What I claim is: 1.`In a washing machine of the class described having a spraying chamber, means for supporting articles in said chamber, a spraying device below the supporting means and arrangedto throw liquid jets against said articles, resistance members above the spraying device for controlling the pressure of the liquid jets against said articles, and means movably vconnecting the resistance members, to the machine, said members having depending curved portions in the path of the liquid jets and movabie to different posipressure of the liquid against this position of the greatest resistance the screens 42 oder a resistance to the water jets of such a g magnitude that the riskoi the dishes being over- V Screens 42' are so as to facilitate the swinging of the screens from suspended into operative tion of the water `iets.

Instead of the screens sist of small rods, pieces ofnetwork andthe like.

vIt is kalso possible to use rubber sheets for this, p s l s ashere shown the 42 are providedon the dish supporting basket proper they should, lon the one hand, be sufilare rotated ciently light as to ensure that they or swung upwardly lunder the action of the water jets and, on the other hand, suiliciently heavy "as to remain unintluenced by the more nnely divided` rinsing water sogas to m tain their suspended position under the ack is eliminated while simultaneously an effective washing of the glasses is ensured.

at their free'ends somewhat bent device arranged resistance members v basket.

said jetsto control the the articles in said tions'by the pressure of chamber.

2. In a washing machine having a spraying chamber, a basket for supporting articles adapted f to be placed in said chamber, a first spraying device arranged to throw relatively coarse jets against against said articles, perforated resistance screens in said chamber, and means movably connecting said screens to the basket, said screens being movable by the pressure of the coarse liquid iets to reduce the. pressure of the latter asainst'the articles in said basket. H

3. In a washing machine having a spraying v chamber, a basket for supporting articles adapted to'be placed in said chamber, a first spraying to ythrow relatively ycoarse liquid jets against said articles, a second spraying -device arranged to throw relatively fine liquidjets against said articles, perforated resistance screensI suspended in said chamber, and means movably connecting the upper ends .ofsaidscreens to said basket, said screens being movable bythe pressure of the coarse liquid jets to reduce the pressure ofY the latter against the articles in said liquid l said articles, a second sprayingdevice arranged vto throw relatively fine liquid jets Torn) ERIK DANIEL ninna.` 

